So, what is the cleverness in this?

The right bit's meant to be a scroll bar. If this was in the "Clever" pool, it should probably go back...

Then it's a pretty badly drawn scroll bar.

Actually, that looks a lot like the old default X Windows scrollbar style.

That said, the fact that this joke is widespread enough to have a tag of its own disqualifies it from the Clever pool, IMO.